/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package ru.miit.elearning.servlets;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import ru.miit.elearning.hibernate.dao.CourseDAO;
import ru.miit.elearning.hibernate.dao.HibernateUtil;

/**
 *
 * @author Cyclone
 */
public class SignTutorOffServlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");

        String message = null;
        Session session = null;

        String from = null;
        int courseId = -1;
        int userId = -1;
        try {

            courseId = Integer.parseInt(request.getParameter("courseId"));
            userId = Integer.parseInt(request.getParameter("userId"));
            from = request.getParameter("from");

            session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            CourseDAO courseDAO = new CourseDAO(session);

            String title = courseDAO.signTutorOffCourse(userId, courseId);

            String userName = courseDAO.findUserNameById(userId);
            if (session != null && session.isConnected()) {
                session.getTransaction().commit();
            }

            message = "Тьютор <a href='Profile?id="+userId+"' title='Перейти в профиль тьютора'>" + (userName != null ? userName + " " : "(профиль) ") + "</a>" +
                    " снят с курса <a href='Course?id="+courseId+"' title='Подробнее о курсе'>\"" + title + "\"</a>";

            getServletContext().setAttribute("message", message);
            //response.sendRedirect("SignTutors?courseId=" + courseId);
            if (from != null) {
                response.sendRedirect((from.equals("SignUser") && userId != -1) ? "SignUser?id=" + userId : "");
            } else {
                if (courseId != -1) {
                    response.sendRedirect("SignTutors?courseId=" + courseId);
                } else {
                    response.sendRedirect("Courses");
                }
            }
        } catch (Exception e) {
            if (session != null && session.isOpen()) {
                session.getTransaction().rollback();
            }
            e.printStackTrace();

            message = "Ошибка отчисления с курса";
            getServletContext().setAttribute("message", message);
            //response.sendRedirect("SignTutors?courseId=" + courseId);
            if (from != null) {
                response.sendRedirect((from.equals("SignUser") && userId != -1) ? "SignUser?id=" + userId : "");
            } else {
                if (courseId != -1) {
                    response.sendRedirect("SignTutors?courseId=" + courseId);
                } else {
                    response.sendRedirect("Courses");
                }
            }

        } finally {
            if (session != null && session.isOpen()) {
                session.close();
            }
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
